Family Dollar complaint: Very rude and unprofessional associates

While visiting the family dollar located on Lillian Highway, Pensacola, FL, in which I have shopped at for over ten years, I came across two of the worst associates in awhile. The cashier was coughing all over the place and already had an attitude before I even reached her register. I was purchasing snacks for the home and had her ring up some chips that were labeled 25.00 but they came up 26.00, I explained there was a sticker that stated 25.00, she started arguing with me, I asked for a manager (Katy) and explained to the manager and showed her the sign and stated the customer is always right and that I used to be a district manager over 20 years ago and she threatened to call the police on me after some choice words, I own my own business, paying the extra dollar was not a problem, I asked for her manager because I know she is just an assistant or her district manager number (to no avail) and she told me to never frequent the store again, I will be coming there next week to make a formal complaint with the store manager of that store.